After confirmed visiting permission, NDU Library must be visited on the exact date given. In addition to the taxi services, NDU Library is also reachable via local transportation. From Helsinki city center, take subway towards east and get off at Herttoniemi subway station. From Herttoniemi, take local bus n:o 86 (Santahamina). At Santahamina military checkpoint step off the bus and show your passport to the military police. After confirming the permission, there is some 200 m walking to the Santahamina Building, in which the NDU Library is located. There is also a cafeteria serving the customers. More information of Helsinki local transportation can be found here.